If you saw Comet Halley when the comet was 0.8 AU from Earth and you observed a visible tail 4 degrees long, how long was the tail in kilometers? (Hint: Use the small-angle formula.) (Note: 1 AU = 1.5 ✕ 109 km.) Suppose that the tail was not perpendicular to your line of sight. Is your first answer too large or too small?

If you saw Comet Halley when the comet was 0.8 AU from Earth and you observed a visible tail 4 degrees long, how long was the tail in kilometers? (Hint: Use the small-angle formula.) (Note: 1 AU = 1.5 ✕ 109 km.) Suppose that the tail was not perpendicular to your line of sight. Is your first answer too large or too small?

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